not rolled by the roulette
Wither is a channelled spell that applies the Hinder debuff, which reduces their movement speed, and a stacking Withered debuff, which increases chaos damage taken, in an area periodically while channelling.
This used to be part of the first couple of versions of the Wraeclast Roulette..
Level requirement: 10.
The roulette doesn’t roll this gem, so its delivery options haven’t been worked out.